Looks like Argos deal has finished but still showing £19.99 at Currys. I couldn't change the deal URL so here's a link to the Currys item...http://www.currys.co.uk/gbuk/computing-accessories/networking/powerline/tp-link-tl-pa4010kit-av600-powerline-adapter-twin-pack-10143560-pdt.html?intcmpid=display~RR
It has good reviews and if you're still worried it also comes with 3 year warranty.
Same price at Amazon.
Using advanced Home Plug AV technology, TL-PA4010 KIT provides users with stable, high-speed data transfer rates of up to 600Mbps on a line length of up to 300 meters. With speed of up to 600Mbps, TL-PA4010 KIT enables heavy-bandwidth applications like HD streaming, on-line gaming and large file downloading, turning your home into a robust and high-speed networking.
Homeplug av standard compliant, high-speed data transfer rates of up to 600mbps miniature design, smaller than most powerline adapters at the market, blends discreetly in front of any power outlet no new wires, easy plug and play operation, no configuration required.
Best used with pcs, game consoles and smart tvs.
Compatible with homeplug av2, homeplug av.
Size L16.9, W11.8, D8.3cm.
Manufacturer's 3 year guarantee.